package thread;


public class StringBuilderDemo {
    public static void main(String[] args) throws InterruptedException {
        StringBuffer builder =new StringBuffer();
        Thread t1 =new Thread(){
            public void run(){
                for (int i = 0; i < 100; i++) {
                    builder.append("a");
                }
            }
        };
        Thread t2 =new Thread(){
            public void run(){
                for (int i = 0; i < 100; i++) {
                    builder.append("b");
                }
            }
        };
        t1.start();
        t2.start();
        Thread.sleep(1000);
        System.out.println(builder.length());
    }
}